Damp heat does penetrate far more efficiently than dry heat. Less heating time is needed and the heat passes into the deeper tissues of the penis. However, a rice sock is not the best way to apply damp heat, as Mjolnir points out above.
The best thing is to go to your local drugstore/chemist and buy a microwaveable gel heat/cold pack. (Buy two. Everyone should have one in the freezer in case of sprains or strains anyway as well as their PE one. They are cheap. )
These should not be used directly against the penis (they will stick; ouch), so wrap a thin damp cloth (T shirt material/dishcloth etc.) around your penis and apply the gel pack over that.
Before I started using an IR lamp, I used gel packs for years. They are excellent.
firegoat is fully RETIRED from Thundersplace.
All injuries happen from "too much", or "too much, too soon" or "doing the exercise incorrectly".
Heat makes the difference between gaining quickly or slowly for some guys, or between gaining slowly instead of not at all for others. The ideal penis size is 7.6" BPEL x 5.6" Mid Girth. Basics.... firegoat roll How to use the Search button for best results